I originally planned to but I decided that I'd want to pursue this project on my own. Besides, there are some problems in making others help because you have to plan and you cannot make design changes on the fly...

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Lol nice idea for a project, I like building cool things but I don't have the patience to work on one thing for more than about a week so I have to take that into consideration sometimes
I can work around it sometimes by building two things at once.
Do you do anything like that or do you just have the patience to straight build through all that?

use world edit to help! it really speeds up production. for example it took 9 hours to make a 50,000 block spherical shape for the hunger games thing. it would take 10 seconds minimum to do that with double the blocks...

Do you know how numbering on runways work? You should make sure you read up on this before assigning them numbers or it'll annoy some people in the aviation industry that observe your work! It is related to the compass direction and there can only be Runway 01 through Runway 36. Assuming you only build your runways NORTH <-> SOUTH and EAST <-> WEST (not diagonal), there are only about 4 numbers you can actually use.

So for Runway 09, you x10, which is approximately the heading in degrees of the runway, so RW09 -> 90°, which is facing exactly East, where the sun rises from.

use world edit to help! it really speeds up production. for example it took 9 hours to make a 50,000 block spherical shape for the hunger games thing. it would take 10 seconds minimum to do that with double the blocks...

As in a sphere or cone of glass that encloses your hunger games map? That is what WorldEdit is for. There is a command line where you specify the center, radius, and height and it automatically generates. I'm 99% sure this is what the famous Survival Games map used. Takes about 5 seconds to type it in. I made one but I manually went around and touched it up in a few spots where it intersected ground and trees.

Because of unforseen problems the first build (aka problems with terrain), I have made the decision to restart the project at an early stage, before a lot work has been done, and make it in a superflat environment instead.

if u wanna build something underground that will be a bad choice, since it's only 3 layer of dirt and 1 layer of bedrock

I usually play survival mode, but browsing other's creations in the web made me want to indulge in maaking a big structure also. Therefore, I have started a project (long term) in minecraft to make a regional airport.